Amperium (unitas)

Simplex ammetri ferri moventis exemplar exhibitorium. Cum fluxus per spiram augeatur, tubus mergens porro intra spiram trahitur, atque index ad dextram errat.

Amperium, signo A, saepe amp imminutum, est unitas basalis SI fluxus oneris electrici, ex Andrea Maria Ampère appellata, mathematico et physico Francico, qui pater electromagntismi cum Ioanne Christiano Ørsted physico Danico aestimatur.

Definitio mathematica

Amperium anno 1948 sic definitum est, postulando constantem magneticum in lege Biot-Savartiana:

${\frac {\mu _{0}}{4\pi }}=10^{-7}\;{\frac {\mathrm {kg} \;\mathrm {m} }{\mathrm {A} ^{2}\;\mathrm {s} ^{2}}}$.

Fluxus electricus constans fit si in duobus conductoribus parallelis contineatur, longitudinibus infinitis, quorum diametram neglegere possumus, uno metro subtiliter inter eos, vim in quoque conductore creat magnitudinis 2×10^–7 Newtonii per metrum conductoris.

Bibliographia

• Bodanis, David. 2005, Electric Universe. Novi Eboraci: Three Rivers Press. ISBN 978-0-307-33598-2.
• Herman, Stephen L. 2020. Delmar's standard textbook of electricity. Ed. septima. Australia et Brasilia: Cengage. ISBN 9781337900348, ISBN 1337900346.
• Kowalski, L. 1986. "A short history of the SI units in electricity." The Physics Teacher 24 (2): 97–99. Bibcode:1986PhTea..24...97K. Archivum.
• Monk, Paul M. S. 2004. Physical Chemistry: Understanding our Chemical World. John Wiley & Sons. ISBN 0-471-49180-2.

Nexus externi

• "The NIST Reference on Constants, Units, and Uncertainty."
• "Definition of ampere and μ₀."'